This is an apolitical forum for discussions on the Axis nations and related topics hosted by Marcus Wendel's Axis History Factbook in cooperation with Christian Ankerstjerne’s Panzerworld and Christoph Awender's WW2 day by day.
Founded in 1999.
The main difference is that the model ZB30J is constructed for the German standard 7.9 mm bullet, ZB30 is constructed for much stronger Czech 7.9 mm bullet like and ZB26. There are also differences from the outside.
FN Herstal is produced ammunition for both the Serbian and the Yugoslav army, but by the Serbian and Yugoslav specification. For the Serbian army 7 mm Mauser and for the Yugoslavian army standard 7.9 mm German Mauser. Sometime after the 1927th the ammunition was made in Yugoslavia.
Welcome to forum. Yes, it seems to be Suomi submachine gun. It is also rather commonly known that Stroop's SS-troops had Suomi submachine guns among their weaponry from other photos taken during uprising of Warsaw Ghetto.